centos7中安装docker步骤

1、下载repo包docer-ce，安装
cd /etc/yum.repos.d/
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O docker-ce.repo
yum install -y yum-utils device-mapper-persistent-data lvm2 
yum install docker-ce

2、设置开机启动
systemctl enable docker
systemctl start  docker

3、配置阿里云镜像加速
vi /etc/docker/daemon.json ,内容如下：
{
  "registry-mirrors": ["https://4piak27r.mirror.aliyuncs.com"]
}
#重启docker服务
systemctl restart  docker

4、开启iptables的网桥转发
vi /etc/sysctl.conf,添加以下内容
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1

sysctl -p #ok